Well-drilling apparatus



0. E'. L/Woo 7"@ ATTORNEY WITNESSES Mar; 27, 1923. 1,449,533

O. yE. MOORE WELL DRILLING APPARATUS Filed Jan. 50, 1922 5 sheets-sheet2 Wn'NEssEs ATTORNEY INVENTOR Mar, 27, 1923. 1,449,533

O. E. MOORE WELL DRILLING APPARATUS Filed Jan. 30, 1922 3 sheetsshee I(5 INVENTOF vmslw I ali-.'Moor@ ATTORNEY Patented 'Man 2,7, 192:17.k

OSCAR E. MOORE, OF DOB/BIS, CALIFORNIA..

WELL-DRILLING APPARATUS.

Application filed January 30, i922. Serial No. 532,817.

To @ZZ whom tlmag/ conce/rn lle it known that I, @scan E. Moons, acitizen oF the United States, residing at Dorris, in the county ofSiskiyou and State oi Cali'lornizuhave invented new and us fulImprovements in lVelLDrilling Apparetus..v oi which the following; issiiecilication.

My invention relates to well drilling apparatus and has for its object;tirst, to provide an outer drill tube and anv inner drill tube and meansfor driving said inner drill tube 'from said outer drill tube7 said in sbeing adapted to be operated iroinv the upper end of the outer drilltube to disengagge said inner drill tube trom said outer drill tube toremove the saine, second, to provide an outer drill tube and a. shortinner drill tube and means Vtor driving said inner drill tube from said'outer drill tube and means lor disengaging said inner drill tube fromsaid outer drill tube whereby the inner drill tube may be removed fromthe outer drill tube without withdrawing the outer drill tube from thehole. i

A further object of my invention is to provide an outer drill tube and ashort inner drill tube adapted to be engaged and driven by the outerdrill tube, the drivingv engagement ot the tubes being such that theinner drill tube may be disenoag'ed from the outer drill tubo by meansor a rope so that said inner ydrill tube may be removed Yfrom the outerdrill tube` without necessitating` u'ithdiawiup,` the outer drill tubeLlronl the well hole.

lily iuwintion is particularly adapted Ylor driving oi' deep wells wherestrata ot difterent hardness are encountered. ln drilling` deep wellsonly a certain amount of weight is available to drive the drilldown\\fardly,.

and when drilling through hard strata the weight of downward pressure isnot sulicient to force the drill downwardly and the drill merely slipsover the hard surface ot the stratum. My invention contenualates drillingr a small. hole through these hard strata in advance oli the largerhole by lengthening; the inner drill tube and telesnoping` it throughthe bottom ot the outer tube.

ln my invention the inner tube and inner drill may be quickly removedfrom the well, leaving` a clear circular openin01 in the center otthe'bottom of the outer drill, said opening being approximatelyone-hallv the diameter oit the outer tube. rl`hen by raisingthe outertube and drill a short distance, churn drills and cable tools may befreely used through this opening and the hardest strata drilled withoutremoving the outer or main drilling tube from the well. ln this methodthe available weight is concentrated upon the smaller drill whendrilling through hard strata, and suliicient weight is available todrive the drill downwardly. ln conjunction with this the detachabledriving connection between the outer drill tube, upon which the reamerismounted, and the inner drill tube. upon whichk the smally drill ismounted, is very beneficial in. that a new drill may be mounted upon theinner drill tube without necessitating withdrawing the outer drill tubefrom the hole. And further, in the use oi' a small drill and a followingreumer, the

- hardest work is placed upon the drill, which,

distance in advance of the larger hole in such sands, then remove thesmall drill from the inner tube and attach the desired lengtho't' screenpipe to the inner tube and lower `it'into` place in the same manner'asil placing' the inner drill 'in drilling position, then. the outer tubemay be left in the well for well casing with the screen attached asStated.

The device is also uselul in furnishing a means of access to the bottomot' the well hole so that cementing or plugging may be advantageouslyaccomplished when neces saryor desirable and a core barrel bit may beused at any time.

Frequently it is necessary to cement the well outside the'well casing inorder to cut oft :ater from running into oil sands.

llllith these and other objects in view which will be hereinafter Jullydescribed and particularly pointed out in' the claims, the inventionconsists in the novel construction and arrangement oit parts illustratedin the accompanying drawings forming a part of this specilication, inwhich lligure l is a vertical sectional View of a drilling apparatusembodying my invention,

showing the inner and outer drill tubes in driving engagement with eachother.

Figure 2 is a similar view with the inner drill tube removed, a verticalsection of one of the driving lugs of the inner tube being shown indriving relation vwith the outer drill tube.

Figure 3 is a vertical sectional view of the inner drill tube with theoperating spear inserted therein to retract the tube latch.

Figure 4l is a vertical sectional view of the upper portion of the innerdrill tube showing the spear latch in engagement with the inner drilltube.

Figure 5 is a similar view showing the weighted` collar in engagementwith 'the spearflatch cam whereby the spear may be disengaged from theinnei' drill tube.

Figure 6 is a horizontal section of the device on the line 6 6 ofFigure 1. y

Figure is a horizontal section of the inner drill tube on the line 7-7of Figure 1.

Figure 8 is a bottom plan view of the device.

Figure 9 is a diagrammatic view of a part ofthe engaging and disengaginglinis7 the cams-being'laid outflat to illustrate the action of the samerelative to the driving lugs of'theinner drill-tube. y

VFigure 10'is a-detail-view ofthe weighted collar. l

Like characters of reference `indicate like parts inthe various views. iy

In the drawings 1 designa-tes the outer drill tube which has a'reamingcutter 2 screw threaded into the `rear end thereof and hav ing anupwardly facing shoulder Secured within theouter drill tube somedistance above the shoulder 3 is 'a cam ring 1- which is'provided withan upwardly facing cani surface `formed with alternate high and llowportions. Secured within the outer drill'tube some distance 'above thecam ring l are cam plates 5 which have*downwardly `facing cam surfacesformed with high lportions, said high portions being disposed aboverespective low portions of the cam surface of `the cam ring 1l, In lthepreferred embodiment of any invention :two cani yplates 5 are=provided,` although any number may be used. Said Icam plates 5 arespaced apart and form slots 6 therebetween, and have diagonally disposedupwardly facing cam suifaces 7 formed -at the upper ends thereof,leading yupwardly from said slots, The cam .surface `of the cam ring 4Lis provided with relatively high portions 8 which are disposed directlybelow respective slots 6. The upper-ends of said high portions 8 areslanted downivardlytoward lthe left, Ias designated at 49, and l,leadinto respective low portions 10, and high portions 11 of the cam platesVare ydisposed above respect-ive low portions 10 and have surfaces 12 atthe em treme end thereof which slant upwardly plates to the left andlead into respective longitudinal recesses 13 formed in the cam Highportions lll are formed on the cani ring l and extend upwardly justbelow respective recesses 1237 and have surfaces at the extreme upperends thereof which slantdownwardly and to the left and lead intorespective low portions 16 of the cam ring. High portions 17 lare formedon the cam plates 5 and :entend downwardly towardrespective low portions16 and have surfaces A18 which slant upwardly and to the left and. leadinto respective slots 6.

1S) designates an .inner drill tube which adapted to fit within the camring f-iand the ram plates il pair of lugs 2O are secured upon oppositesides of the inner drill tube and are adapted to engage the cam surfacesof the cam ring l and the cam plates When the inner drill tube isinserted intothe outer drill tube from the upper end thereof, the lugs2O engage respective upwardly facing cam surfaces? of the cam plates andare guided thereby into respective slots 6. Upon further downwardmovement of the inner drill tube the lugs 2O encounter respectiveslanting surfaces 9 of the high portions S and are guided thereby intorespective low portions 10 of the cam ring, the drill tube rotating tothe left as it moves downwardly. rThe drill tube is now moved upwardly,and the lugs encounter respective slant portions 12, of the highportions 11 of the cam plates 5, and are guided thereby into respectiverecesses 13, the tube'turningl to the left during` this movement. rlhisengagement of the lugs 20 with respective recesses 153 constitutes thedriving'engagement of the outer drill tube with the inner drill tube,means.l which willfbe hereinafter described, being lprovi ded forretaining said lugs in engagement with said recesses. lVhen it desired'to remove the inner drill tube from the outer drill tube, saidinnerdrill tube iS movedl downwardly from this position, whereupon thellugsQO encounter respective slant surfaces 15, of the high portion 1e ofthe cam ring 4l, and are guided into respective low portions 16y thedrill tube turning toward the left during this movenient. rlhe innerdrill tube is then. moved upwardly and the lugs 20 engage respective camsurfaces 18, of the high portions 17 of the cam plates 5, and are guidedlinto respective slots 6 thereby. the inner drill tube turning towardthe left during this Inovement. When the lugsfQ() move into theslots 6the tube may be lifted 'upwardly out of the outer drill tube.

it will be noted that the high portions 7% 11 and 17 of one of the caniplates `5 are longer than correspondinghigh` portions of the other Ycamplate 5; and that the correspending high portions 8 and 14 of the canidevice.

ring 4 are also relatively high, respectingV inner drill tube before theopposite lug` en` `gages its respective cam surfaces whereby e the lugsare prevented from engaging the opposite sides of any corresponding pairof high portions and clamping thereon.

A series of radial projections 21 are secured within the inner drilltube near the bottom thereof. A. latch lever 22 is pivoted at a pointintermediate the ends thereof upon the inner wall ofthe inner drill tubeand has its upper end lying in the planes of said radial projections 21,and is provided at its lower end with ay latch mehr ber 23 which .isadapted to normally project through a slot 24E in the wall of the innerdrill tube. A spring 25 having its one end secured to the inner drilltube, and havingthe other end thereof engaging said latch lever 22,serves to retain said latch lever in its normal position with said latchmember 23 projecting through said slot 24. The latch member 23 is sodisposed that, when the lugs 2O are in engagement with respectiverecesses 13 said latch lever en gages the shoulder 3 of the reaming`cutter 2 to prevent the inner drill tube from moving downwardly anddisengaging said lugs 2O from the recesses 13. Vedge cams 26 are formedupon the outer drill tube and are disposed within respective recesses 13and serve to lcenter the inner drill tube within the outer drill tubewhen said lugs 20 are in engagement with said recesses A. drill 27 isscrew threaded into the lower end of the inner drill tube, and holes 2Sare formed just above the same to allovv water to be pumped down throughthe drill tubes to wash away the cuttings of the drill.

29 designates the operating spear ofthe The lower end of the spear kispointed as is designated at 3() and a rope 31 is secured to the upperend thereof.` said upper end being rounded, yas designated at 32, toallow weighted collar 33 to slide over the same. latch lever riii-'hasrits upper end secured upon said speen and has its lower end adapted tomove in a slot formed in said spear. The lower end of said latch lever311 is provided with a latch member 36 having an upwardly facingshoulder 37 formed thereon and a downwardly facing cam surface 33fformedbe low said shoulder. A cam 39 is mounted upon said latch lever 34 somedista-nce above said latch member 33, and the. weighted collar isadapted. to slide over said spear member 36 within the slot 35.

and engage said cam 39 to retract the latch An inwardly extending flangeZl() is formed at the upper end of the inner drill tube and has itsupper surface slanted, as designated at Ll1, to guide the spear 29within the aperture thereof.

The latch member 36 is adapted to engage the under surface of the flange40 with the shoulder 37 forv purposes hereinafter described.

llhen it is desired to remove the inner drill tube from the outer Adrilltube the spear 29 is lowered down into the cuter drill tube by means ofthe rope 31. The spear passes into the inner drill tube, and the lowerend thereof engages' the radial pro- 'ner drill tubey moves downwardlythe lugs y2O encounter the high portions l/l of the cam ring, ashereinbefore described, and are guided into the low portions 16, theinner drill tube turning to the left during this movement. rlhe rope isthen pulled and the spear moves upwardly and the shoulder 37 of 4thelatch member 36 engages the lower surface of the flange 40, and theinnerdrill tube is pulled upwardly thereby. .As the inner drill tube ispulled upwardly the lugs 2O are guided into the slots 6 by means of theslant surfaces 18 hereinbefore referred to. The inner drill tube is thenpulled upwardly and removed from the outer drill tube as desired.

When it is desirel to replace the inner drill tube in driving relationwith the outer drill tube, it is lowered by means of the spear 30 andtherope 31 and is guided down through the slots 6 by the cams 7. As thelugs 20`rea`ch points in said slots 6 in the plane of the recesses 13the latch member 23 engages the shoulder 3 and stops the downwardmovement of the inner drill tube. The spear then moves downwardly andretracts said latch member, as rhereinbefore described, and the drill,tube then moves downwardly until the lugs 2O engage the low portions 10,being guided by the slant portions 9. The spear is then pulled up- 20 tocenter the inner drill tube within the spear to enr 'e the-cam uch disenthe l i xber Ytroni the whereupon the Spear may be pulled upm ardiyquicklyA The collar cannot ,lip down pas the latch In uber o as theupwardlj..v shoulder il? thereoil projects sonic distn beyond theoutermost portion. or tl lllhen it is desired to rcinovc tube from Ylowered into the outer `lrl ai l'is lguided into the inner drill tube bythe portion ot the ilange ll0, and the point d end il@ thereo engagesthe radial j'irojections and the end et the latch 522 rto re ct thelatch inernber 23 troni w nient with the shoulder 3. Upon the releaseolf the latch nieniber 23 from enli'agi'eiiient with the s" ider 3 theinner drill tube drops oi its own weight and the lugs 2O are guided intothe low lportion i6 ol the cani ring i by the slanting` surfaces l5. Thespear is then pulled upv-Fardly, and the latch ineinber 3G engages theunder side of the flange e0, whereupon the inner drill tubo nievesupwardly with the spear. the lugs 2G nieve out oi the low portions 1Gthey engage the slant surface i8 olf the high portions i7 of the canaplates and are guided into the slots 6, after which the inner drill tubeinay be removed troni the outer drill tube without further manipulation.

The weighted collar 33 is orrned in two sections which are hingedtogether as at 33 and a bolt 33 holds the two sections in rllhisconstruction will ena 'al ti closed position able the collar `to beeasily placed on the cables.

llaving` thus fully described my invention, l claim:

l. ln a. device ot the character described, the combination with anouter drill tube, ot an inner drill tube, a cani ring; secured on saidouter drill tube and having an upwardly facing earn surface thereonformed with alternate high and low portions, earn plates secured on saidouter drill tubev above said cani ringr and havingv downwardly iaceamsurfaces toriued with high portions disposed above respective lowportions oi said upwardly lacing` cam surfaces et the carin ring',saideain plates beine` spaced apart to torni slots therebetween, andlugs on said inner drill tube adapted to pass through respective slotsto engage said cam surfaces.

ifi/iones and low portions`l` cani plates secured jaid outr drill tubialimve said cam ring r ha lo\\ui'.vardly iacingi cani suraces 'formedwith high portions disposed i' pective low portions ot said upwa'dlyracing cani surface or the cani ring a longitudinally disposed recessesTsauf fwn plats beine' spaced apart to torni slots therel'ietween, andlugs on said inner drill tube adapted to pass through respective slotsand to engage said cam sur- .ln a device ot the character described, thecon'iliiintion with an outer drill tube ot an inner drill tube, a camring secured on said outer drill tube haring an upwardly facing camsur'l'ice iii'uzned with alternate high and low portions` cani platessecured on said outer rill tube above said earn ring and having`downwardly facing' cam surfaces thereon, formed with high portionsdisposed above respective low portions of said upwardly 'Facing' canisurfaces ot the cani ring? said cani plates being' spaced apart t( tornislots therebetween and hailing` diagonally laeirgi' cani si-:tacesextendingr upwardly troni said slots, and lugs on said inner drill tubeadapted to pass through respective slots to engage said cani surfaces.

a device ot the character described, the combination with an outer drilltube, of an inner drill tube, a cani ring; 'secured on said outer drilltube and having'an upwardly facing? cani surface iorn'ied with alternatelnit and low portions, earn plates secured on said outer drill tubeabove said cam ring and havin downwardly 'lacing cana surfaces termedwith high portions disposed above resne 'tive low nortions ot saidupwardly iiacinc; cani surface ot the cani ring and formino'longitudinally disposed recesses, said cani plates being` spaced apartto 'form slots therebetween, lugs on said inner drill tube adapted topass through respective slots and to said Cain surfaces`r and. wedgecams secured on d outer drill tube adapted to engage respective lues asthey are positioned is said recesses.

5. ln a device ot the character described7 the combination with a drilltube having an inwardly exterulingiflange, ot a spear ad apted to passthrough said flange a spring; latch or said spear adapted to engage'said 'ila-nger cani mounted ou said latch and adapted to normallyproject 'troni said spear, and a weighted collar adapted to pass oversaid spear and eneae'e said cam to retract said latch trom engagementwith saidilange.

G. .in a device o the combination inwardly extending;

`h a drill tube havin@ au danceA et a spear adapt.- ed te passtl'iroue'h said rang/ge, a spring' lever riounted on said spearh a latchinernber inounted on said lever andadapted to norrnally projectlaterally 'trom said spear and having an upwardly facing shoulder and adownwardly facing cam surface, a cam mounted on said lever and adaptedto normally project from said spear, and a weighted collar adapted topass over said spear and engage said cam to retract said latch fromengagement with said flange.

7. 1n a device of the character described, the combination with a drilltube having an inwardly extending flange, of a spear adapt ed to passthrough said Piange and having a longitudinal slot formed therein, aspring lever mounted on said spear and adapted to move in said slot, alatch member mounted on said lever and adapted to normally project fromsaid spear and having an. upwardly facing shoulder and a downwardlyfacing cam surface, a cam mounted on said lever and adapted to normallyproject from said spear, and a weighted collar adapted to pass over saidspear and engage said cam to retract said latch from engagement withsaid flange.

8. In a device of the character described, the combination with a drilltube, of a spring lever mounted within saidtube, and a' spear adapted topass into said tube and to engage said spring lever to move said springlever.`

9. 1n a device of the character described, the combination with a drilltube having a spring` lever mountedwithin said tube, a series of radialprojections in said tube, and a spear adapted to pass into said tube andto engage said spring lever and said projections to move said spring`lever.

l0. In a device of the character described, the combination with a drilltube having a slot formed therein, a spring lever mounted within saidtube, a latch member rmounted on said spring lever and adapted rtonormally project from said slot, and a spear adapted to pass into saidtube and to engage said spring lever to retract said latch member intosaid tube. o

l1. In a device of thecharacter described, the combination with a drilltube having a slot formed therein, a spring lever mounted within saidtube, a series of radial projections in said tube, a latch membermounted on said spring lever and adaptedto normally project from saidslot, and a spear adapted 'to pass into said tube and to engage saidspringl lever and said projectionsy to retract said latch member intosaid tube.

,12. 1n a device of the character described, the combinationwith a drilltube having a slot formed therein and having an inwardly extendingflange, a spring lever mounted within said tube, a latch member mountedon said spring lever and adapted to normally project from said slot, aspear adapted to pass through said flange, a spring latch on said spearadapted to engage said flange, a cam mounted on said latch and adaptedto normally project from said spear, and a weighted collar adapted topass over said spear and engage said cam to retract said latch fromengagement with said flange.

1.3. ln a device of the character described, the combination with adrill tube having a slot formed therein and having an inwardlyextendingvflange, a spring lever mounted within said tube, a series ofradial pr0jections in. said tube, a latch member mounted on said springlever adapted to normally project through Said slot, of a spear adaptedto pass through said flange, a spring latch on said spear adapted toengage said flange, a cam mounted on said latch and adapted to normallyproject from said spear, and a weighted collar adapted to pass over saidyspear and engage said cam to retract said latch from engagement withsaid flange.

f la. In a device of the character described, the combination with anouter drill tube having an upwardly facing shoulder formed thereon, ofan inner drill tube having a slot formed therein, a cam ring secured onsaid outer drill tube and having an upwardly facing cam surface formedwith alternate high and low portions, cani plates secured on said outerdrill tube above said cam ring and having downwardly facing cam surfacesformed with high portions disposed above respective low portions of saidupwardly facing cam surfaces of the cam ring and forming longitudinallydisposed recesses, said cam plates being spaced. apart to form slotstherebetween, lugs on said inner drill tube adapted to pass throughrespective slots to engage said cam surfaces, a spring lever mountedwithin said tube, a latch member mounted on said spring lever andadapted to normally project through said slot and adapted to engage saidupwardly facing shoulder, and a spear adapted to pass into said tube andto engage said spring lever to retract said latch member from engagementwith said shoulder.

15. 1n a device of the character described, the combination with anouter drill tube having an upwardly facing shoulder formed therein, ofan inner drill tube having a slot formed therein, a cam ring secured onsaid outer drill tube and having` an upwardly facing cam surface formedwith alternate high and low portions, cam plates secured on said outerdrill tube above said cam ring and having downwardly facing cam surfacesJformed with high portions disposed above respective low portions ofsaid upwardly facing cam surfaces of the cam ring and forminglongitudinally disposed recesses, said cam plates being spaced apart toform slots therebetween, lugs on said inner drill tube adapted to passthrough respective slots to engage said caml surfaces, 'a spring levermounted within said drill tube, a latch member mounted on said springlever and adapted to normally pioject through said slot and adapted toengage said upwardly vlacing shoulder, a series `ol radial projectionsin said tube, and a spear adapted to pass into said tube and to engagesaid spring lever and said projectio-ns to retract said latch memberinto said tube.

16. lin a device o'l' the character described the combination with anouter drill tube having an upwardly lacing. shoulder thereon, an innerdrill tube having a slot formed therein, a cam ring` secured on saidouter drill tube and having` an upwardly facing cam surface Yformed withalternate high and low portions, cam plates secured on said outer drilltube above said cam ring and having, downwardly racingam surfaces"termed with high port-ions disposed above tive low portions of saidupwardlyv lacing cani surfaces of the cam ring, said cam plate being`spaced apart to lorm slide therebetween, andl hauling diagonally facingcani surfaces extending upwardly 'troni said slide, lugs secured on saidinner drill tube adapted to pass through respective slots toengage saidcam surfaces, a spring;- lever, a latch member mounted on said spring`lever and adapted to normally projet` thiough said slot to engage saidupwardljy7 'lacing shoulder, and a spear adapted to pass into said tubeand to eng je said spring lever to retract said latch member into saidtube.

l?. ln device ot the character described, the combination with an outerdrill tube having an upwardly racine' shoulder formed thereon, ot aninner drill tube having a slot 'formed therein and having' an inwardlyextendino dance, a cani ring secured on said Aouter drill tube andhaving? an upwardly 'lacing cani sui-tace foiniedwith alternate high andlow portions, cani plates .cured on said outer drill tube above saidcani rino; and hav` 5 downwardly lacing' cani surlaces formed with highportions disposed above resi ect've low portions oit said upwardly'lacing' cam surfaces ot the cam ring' and forming' longitudiiif vdisposed rel casses, said cam plates bei o' spaced apart to torni slotstherebetween, on sf d iuner drill tube adapted to pass from 1 spectiveslot-s engage said cani siirtaf'es.` a` spring lever inounte 'l with'.said tube a Ich member mounted on d spring' lever f ...pted to normallyproiect through saiA slm to cuerno said i.,pwai'-llwY tocino; shoulderna spe adapted to poss through said aange to enquire .said springt leverto retract d latch member into said tube a lat ou said spear adapted toengage said tangy; a cam mounted on latch and d: pted to normallvproiectAtrom the spear, and a weighted ifollar adapted Abetween a to pass oversaid spear and to engage said cam to retract said latch Yfrom engagementwith said lilange.

i8. device oit the character described, the combination with an outerdrill tube having an upwardly facing shoulder, of an inner drill tubehaving a slot Alorined therein and ha an inwardlyY extendinpr liange, acani riirT securedon said outer drill tube and lurvini;v an upwardlytaciirg` cani surface iorniied with alternate high and low portions,cani plates secared on said outer drill tube above said cani ring andhaving dowuwa ""K lacing; cani surliaces 'formed with high portionsdisposed above respective low ortions oit said upwardly facingproiections in said tube, a latch niember mounted on said spring` leverand adapted o normally project through said slot to f said upwardlylacing; shoulder7 a spear nted to pass through said tlange to engagesaid projections and said spring lever to retract said latch .memberinto the tubev a spring' latch on said spear adapted to engage said dane.y a cain iuounted on said latch ano ada-pied to normally project.troni spear, and weighted collar adapted to pass over said spear and toenf-zaid cani to i'eract said spring latch ein engagement with saidflange. i9. ln a device ot the character describ d, the combination withan outer drill tube having); au upwardly 'lacing shoulder', of an innerdrill tube having` alsiot 'tor-.ned therein and having); an inwardly7extending said . ind havinc u upw rdly lacing cani surraco 'loi'inedwith alternate hinjh and low portions cani plates secured on said outerdrill tube above said cani rino' and having' downwardly 'lacing canisurfaces formed with high portions disposed above respectire lowportions olr said upwardly lacing cam surfaces ot the cani ring', saidcani plate bef spaced apart to torni slots thered having;` diagonallyfacing cani surfaces extending' upwardly from saidlslots` lugs ou saidinner drill tube adapted to nass llrough respective slots to cnifai'esaid Icriiu siuaccs, a spring` lever mounted i. ithin said tuben a lzuchmember mounted on said sprung' c and adapted to `norrfually proiectthrough said slot to engage said upiiuirdlj,v

shoulder, a spear adapted to pass lroupjh said tlanu'e to engage saidsprintf ever c rect said lat-ini member into` said uba spring.; latch onsaid spear adapted o enojan-jc said flange, a cam mounted on ksaid latchand adapted to normally project 'from "c, a cani ring' secured on saidouter drill drill tube above said cam ring' and having diagonally facingcam surfaces formed with high portions disposed above respective lowportions of said upwardly facing cam surfaces of the cani ring andforming longitudinally disposed recesses, said cam plates being spacedapart to form slots therebetween, lugs on said inner drill tube adaptedto pass through respective slots to engage said cam surfaces, wedge camson said outer drill tube adapted to engage respective lugs as they arepositioned in said recesses, a spring lever mounted within said tube, alatch member mounted on said spring lever and adapted to normallyproject through said slot to engage said upwardly facing shoulder, aspear adapted to pass through said flangeI and to engage said springlever to retract said latch member into said tube,

a second spring lever mounted on said spear, a second latch membermounted on said second spring lever and adapted to normally project fromsaid spear and having an upwardly facing shoulder and a downwardlyfacing cam surface, a cam mounted on said second spring lever andadapted to normally project from said spear, and a weighted collaradapted to pass over said spear and to engage said cam to retract saidsecond latch member from engagement with said flange.

2l. ln a device of the character described, the combination with anouter drill tube having an upwardly facing shoulder, of an inner drilltube having a slot formed therein and having an inwardly extendingflange, a cam ring secured on said outer drill tube having an upwardlyfacing com surface formed with alternate high and low portions, camplates secured on said outer drill tube above said cam rin havingdownwardly :am surfaces formed with high portions disposed aboverespective low portions of said upwardly facing cam surfaces in the camring, said cam plates being spaced apart to forni .slots therebetweenand having diagonally facing cam surfaces extending upwardly rom saidslots, lugs on said inner drill tube adapted to pass through said slotsand to engage said cam surfaces, a spring lever mounted within saidtube, `a latch member mounted on said spring lever and adapted tonormally project through said slot to engage saio upwardly facingshoulder, a sA ear aoapted to'pass through said flange and to engagesaid spring lever to retract said latch member into te tube, a secondspring lever mounted on said spear, a second latch member mounted onsaid lever and adapted to normally project from said spear and having anupwardly facing shoulder and a downwardly facing cam surface, a cammounted on said lever and adapted to normally project from said spear,and a weighted collar adapted to pass `over said spear and to engagesaid cam to retract said second latch member from engagement with saidflange.

22. ln a device of the character described., the combination with anouter drill tube having an upwardly facing shoulder, of an inner drilltube having a slot formed therein and having an inwardly extendingflange, a cani ring secured on said outer drill tube having an upwardlyfacing cam: surface formed with alternate high and low portions, camplates secured on said outer drill tube above said cam ring and havingdiagonally facing cani surfaces formed with high ,portions disposedabove respective low portions of said upwardly facing cani surface ofthe cam ring and forming longitudinally disposed recesses, said camplates being spaced apart to form slots therebetween, lugs on said innerdrill tube adapted to pass through respective slots to engage said camsurface,wedge cams on said outer drill tube adapted to engage said lugsas they are positioned in said recesses, a spring lever mounted withinsaid tube, a series of radial projections in said tube, a latch membermounted on said spring lever and adapted to project` through said slotto engafre said upwardly facing shoulder, a spear adapted to passthrough said flange and to engage said spring lever and said radialprojections to retract said latch member into the tube, a second springlever mounted on said spear, a ksecond latch member mounted on saidsecond spring lever and adapted to normally project from said spear andhaving an upwardly facing shoulder and a downwardly facing cam surface,a cam mounted on said second spring lever and adapted to normallyproject from said spear, and a weighted collar adapted to pass over saidspear and to engage said cam to retract said second latch member fromengagement with said flange.

23. ln a device of the character described, the combination with anouter drill tube, of an inner drill tube, a cam ring secured on saido`uter drill tube and having an upwardly facing cam surface thereofformed with alternate high and low portions, cam plates secured on said.outer drill tube above said cam ring and having downwardly facing camsurfaces formed with high portions dlisposed yabove respective lowportions of said lli) iso

upwardly facing earn surfaces of Jhe Cani ring, seid cani plates beingspaced apart to forni slots therehetv:een sind lugs on Said inner drillruhe mliipted to pues through respective slots io engage said Cainsurfaces, the high portions of one of the cani plates and thecorresponding high portions of said cani ring being extended beyond theother high portions of the remaining com plate of the ringv whereby oneof Sayid lugs engages seid relnivelj,Y high portions before the otherlug engages iis Corresponding high portions.

ln testimony whereof alii): my signature.

OSCAR E. MOORE.

